The VRP "Type 5" Hot Bodies D817/E817 Aluminum Steering Block Arms are a machined aluminum option for your HB D817, D812 and D815 vehicles, and allow you to adjust the Ackermann geometry in the steering rack. Ackerman affects how aggressive the car feels. More Ackermann makes the car easier to drive and is better suited to low traction surfaces. Less Ackermann makes the car more aggressive and is better for high traction surfaces.

Hot Bodies steering block arms are rated Type 1, with the least amount of Ackermann, through Type 6 with the most amount of Ackermann, and Type 4 being the standard parts included in the kit. The VRP arms use machined ridges on the sides, with a specific number to identify the "type" of arm it is, IE: Type 5 arms are marked with five ridges.